Probably the most important limitation is the memory. Even recent Kindles have 512Mb RAM, which is more than enough for e-book reading, but very little for a recent browser.
The second thing to check is the refresh rate, which is okay for "tuning" pages, but too slow for scrolling.
So for browsing would be more interesting to check an e-ink tablet, maybe with Android. They have more memory, faster display, and adapted browser. Obsidian also runs on Android, without fiddling.
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